【作者】 吕燕飞； 吴希俊； 吴大雄； 王晖；

【Author】 L(?) Yan-fei~(1,2) WU Xi-jun~1 WU Da-xiong~(1,3) WANG Hui~1 (1.College of Materials Science and Chemical Engnieering,Zhejiang University,Hangzhou 310027,China;2.the School of Science,Hangzhou Dianzi University,Hangzhou 310018,China;

【机构】 浙江大学材料与化工学院；

【摘要】 采用 NH₄F 和 Ba（NO₃）₂水溶液沉淀反应制备 BaF₂纳米粉体。在临界过饱和和快速混合过饱和反应条件下分别获得了10nm 和80nm 的 BaF₂沉淀粉体,对不同沉淀反应条件下的成核机制进行了分析。对于低浓度 Ba（NO₃）₂溶液和 NH₄F 固体快速混合反应情形,讨论了过饱和度的合理计算和扩散对形核的作用。更多还原

【Abstract】 3.College of Materials Science and Engineering,Qingdao University of Science and Technologhy,Qingdao 266042,China) The nanocrystalline （nano-） powders of BaF₂ were synthesized by precipitation reactions of NH₄F solids with BaNO₃)₂ aqueous solutions.The nano-powders with the average grain size of 10 nm and 80 nm were obtained under the conditions of the critical supersaturation and of the supersaturation by fast mixing,respectively.The nucleation mechanisms of nano-precipitates were analyzed.The reasonable evaluation of the super saturation and the action of diffusion on the nucleation of the nano-precipitates was discussed for the case of the rapid reaction of the low mass concentration Ba（NO₃）₂ aqueous solutions with the excess solid NH₄F.更多还原